Ketam (Crabs)

Crabs are decapod crustaceans of the infraorder brachyura, which is usually have a "tail" is very short (Greek: brachy = short, ura = tail), or where the abdomen is entirely hidden under thoraks. They are generally covered with a thick shell eksoskeleton, and equipped with a pair of nail chelae). Crabs are found in all oceans world, there are also plenty of fresh water crabs and terrestrial animals, especially in tropical regions. Crabs vary in size from the pea crab, only a few millimeters wide, the Japanese spider crab, with feet reaching to 4 m.